i am collecting sll the stuff to build me a tri power for my small block that will go in my 54 chevy i talked to one of the old timers at hot rod carburation about jet sizes he told me they have never had to put in anything bigger than 55-57 for the primary carb in there projects he said i should jet the primary 56-57 and do the outboard carbs at 55 i have read about people using larger jets on the outer than the middle kinda makes sense when you floor you want more gas so engine doesnt starve at higher rpms, right? (especially if you have a mild cam?) well at the same time i want to listen to the guy because well thats what he does for a living and has the experience to back it up i also asked him about power valve if i should switch to a 4g power valve, he said i could but all i really need to do is loosen the spring pressure and im good to go ,since im running a mild cam vacuum would be low at idle. any opinions suggestions wanted
Listen to your buddy. He is absolutely correct. Unless your motor is a ground pounder his recommendation is correct. Remember you will only be using a power valve in the primary. And you will also need to fatten the idle tubes in the primary.
I didn't say widen I said fatten. Meaning to open the idle tube holes about 2 sizes. As per the post below this if you are going to run straight linkage all bets are off and there is another school of learning to that.
Use a pin drill. If you don't have any or can't find them I will be glad to do it for you no charge .
I have a question regarding a more unique set up. I have bought a 350 with cam, aluminum heads, 671 Weiand blower, with rochester tripower. The guys that originally set it drilled out the main jets to the point that they gas foul the plugs and they are relly black and sooty in a short time. What jet should I run in the center and outboard carbs? Do I need to do anything with the power valves in the carbs? Thanks
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